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What are the disadvantages of relational data ?
Disadvantages
• Performance - If the number of tables among that relationships to be established are large and the tables themselves are voluminous, the performance within responding to queries is absolutely degraded.
• Unsuitable for Hierarchies - Although the relational database approach is a logically attractive, commercially feasible approach, but if the data is for instance naturally organized in a hierarchical manner and stored as such, the hierarchical approach might give better results.
Given the following set of functional dependencies {cf?bg, g?d, cdg?f, b?de, d?c} defined on R(b,c,d,e,f,g) a.Find a non-redundant cover. b.Find a canonical cover.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
What are the Objectives of object design After going through this unit, you could be able to: explain steps of object design; discuss algorithms that reduce costs;
An employee record has the following structure struct employee { int eno; char name[22]; float salary; char dept[10];}; (i) Calculate the record size R in bytes.
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Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
The ABC Bank authority now wants to create a database for their customers. So you are requested to modify your program of Assignment A3 as follows. The main program first displa
Describe in brief about DBMS ?
Give an example of Object Representation For illustration, consider the implementation of a social security number within an employee object that is shown in Figure. The soci
What is data independence? Data Independence: Techniques which permit data to be changed without affecting the applications in which procedure it. There are two types of data
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